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Ion-Exchange Reactions of Cesium¹

ABSTRACT

Column leaching experiments with 0.001N CsCl with 1N KCl or CaCl₂ showed Cs sorption by a number of clays to be much larger from Ca than from K solutions. The sorption affinity of Cs relative to the complementary ion corresponded with that found by others for the Cs-K ion pair, but in Cs-Ca systems the Cs was sorbed to a larger extent than would have been expected from the results of experiments where Cs-Ca ratios in the equilibrium solution were not so small.

While all except a very small proportion of the sorbed Cs was displaced on leaching with 1N KCl, some 36 times as much remained after leaching with equal volumes of 1N CaCl₂.

Vermiculite sorbed very large amounts of Cs (about 1/3 of exchange capacity) from 0.001N CsCl-1N CaCl₂. The sorbed Cs was largely "fixed" against exchange with 1N CaCl₂. This suggests that Cs contained in interlayer spaces of vermiculite results in interplanar distances which will admit K but not Ca.

¹ Published with the approval of the Director, North Carolina Agr. Exp. Sta. as Paper No. 1478 in the Journal Series. Work performed under U. S. Atomic Energy Comm. Contract No. AT-(40-1)-2410.

² Professor of Soil Science, University of California, Riverside; Instructor of Soils, North Carolina State College, Raleigh; and Postdoctoral Fellow, Chemistry Department, University of North Carolina, Chapel Hill, respectively.

Received for publication July 26, 1962. Accepted for publication October 25, 1962.